My father picked this up in a antique store recently. It is a green Devil mug approx 5 inches tall. He is in great shape and has a totally cool face. The bottom is marked
Westwood Noh Mask Handcrafted in Japan

I know it's not "tiki", I was wondering if it was from the tiki family, like the skull mugs, headhunter mugs, etc. Is it something one of a kind? Common? Anyone seen one before?

A 'Noh Mask' is a mask from a Japanese Noh performance - a sort of traditional theatre... so this would be your 'Benihana' originating mug then, I would presume. If you want to 'noh' more about 'noh' just google 'noh' and in 'noh' time you will 'noh' everything there is to 'noh' about 'noh'!